黑莓 - 显示对话框启动，等到对话框关闭 [英] Blackberry - Show Dialog on startup and wait until dialog closes

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问题描述

我尝试了很多，现在我需要你的帮助。我想要做的是以下几点：
当黑莓应用程序启动是/否对话框弹出。
如果用户选择是，做一些事情，之后继续启动。如果用户选择否退出程序。

I tried a lot, now I need your help. What I want to do is the following: When the Blackberry app starts a yes/no dialog pops up. If user chooses "yes", do something and AFTER that continue with the startup. If user chooses "no" exit the app.

我写的，如果你选择是，你应该听到声音后应振动的SSCCE。我当然知道，那code中的Alert.vibrate（）被调用后继续，并没有等待vibraste完成。无论如何，这仅仅是一个例子。调用振动（）应该先和dialogClosed（）应该处理的声音播放之前完全。

I wrote an SSCCE which should vibrate if you choose "yes" and AFTER THAT you should hear a sound. Of course I know, that the code continues after the Alert.vibrate() is called and it doesn't wait for the vibraste to finish. Anyway, it is just an example. The call to vibrate() should come first and the dialogClosed() should be processed completely before the sound is played.

该SSCCE是我走到这一步。我试过很多其他的东西。我敢肯定，这不可能是那么难。我只是不明白这一点。

The SSCCE is what I got so far. I tried lots of other things. I'm sure it can't be that difficult. I just don't get it.

下面是：

package TestDialog;

import net.rim.device.api.system.Alert;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.DialogClosedListener;

public class TestDialog extends UiApplication
{

public static short[] SOUND_ALERT = { 523, 200, //C for 200ms
                0, 200, //Pause 200ms
                554, 200, //C# 200ms
                0, 200, //Pause 200ms
                587, 200, //D 200ms
                0, 200, //Pause 200ms
                622, 200         //D# 200ms         
                                  };

/**
 * @param args
 */
public static void main(final String[] args)
{

    final TestDialog test = new TestDialog();
    test.enterEventDispatcher();

}

public TestDialog()
{

    //the dialog
    final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);
    d.setDialogClosedListener(new DialogClosedListener()
    {

        public void dialogClosed(final Dialog dialog, final int choice)
        {
            if (d.getSelectedValue() == Dialog.YES)
            {
                Alert.startVibrate(2000);
                //do something which takes some time
            }
            else
            {
                System.exit(0);
            }

        }
    });

    //show the dialog
    showDialog(d);

    //now wait for the dialog to call notify
    try
    {
        synchronized (this)
        {
            this.wait();
        }
    }
    catch (final Exception e)
    {
        System.out.println(e.getMessage());
    }

    //finally AFTER the dialog has been closed and everything in dialogClosed() has been done, play a sound
    Alert.startAudio(SOUND_ALERT, 100);

}

private void showDialog(final Dialog d)
{

    UiApplication.getUiApplication().invokeLater(new Runnable()
    {
        public void run()
        {
            d.doModal();
            this.notify();
        }
    });

}
}

OK，其他一些SSCCE。这将启动并显示一个对话框，但随后抛出IllegalMonitorExcpetion：

OK, some other SSCCE. This starts and shows a dialog, but then throws an IllegalMonitorExcpetion:

package TestDialog;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;

public class TestDialog extends UiApplication
{

public static short[] SOUND_ALERT = { 523, 200, //C for 200ms
                0, 200, //Pause 200ms
                554, 200, //C# 200ms
                0, 200, //Pause 200ms
                587, 200, //D 200ms
                0, 200, //Pause 200ms
                622, 200         //D# 200ms         
                                  };

/**
 * @param args
 */
public static void main(final String[] args)
{

    final TestDialog test = new TestDialog();
    test.enterEventDispatcher();

}

public TestDialog()
{

    UiApplication.getUiApplication().invokeLater(new Runnable()
    {
        public void run()
        {
            //the dialog
            final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);

            if (d.doModal() == Dialog.YES)
            {
                System.out.println("selection made yes");
                this.notify();
            }
            else
            {
                System.out.println("selection made no");
                System.exit(0);
            }

        }
    });


        try
        {
            this.wait();
        }
        catch (final Exception e)
        {
            e.printStackTrace();
        }


    //finally AFTER the dialog has been closed and everything in dialogClosed() has been done, play a sound
    System.out.println("done");
}

}

所以我把一个synchronized块周围的wait（）调用，因为我读，该对象必须调用wait（）时进行同步。但是，现在的应用程序显示什么。它运行主方法但某处停止。在模拟器很奇怪的事情发生了：当模拟器仍处于启动和调试器附着在显示屏上书写，应用程序的主方法被调用。嗯，这里是用synchronized块SSCCE。仍然无法正常工作。

So I put a synchronized block around the wait() call, since I read, that the object must be synchronized when calling wait(). But now the app shows nothing. It runs the main-method but somewhere stops. In Simulator very strange things happen: When the simulator is still in startup and "debugger attaching" is written on the display, the main-method of the app is called. Well, here is the SSCCE with the synchronized block. Still doesn't work.

package TestDialog;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;

public class TestDialog extends UiApplication
{

public static short[] SOUND_ALERT = { 523, 200, //C for 200ms
                0, 200, //Pause 200ms
                554, 200, //C# 200ms
                0, 200, //Pause 200ms
                587, 200, //D 200ms
                0, 200, //Pause 200ms
                622, 200         //D# 200ms         
                                  };

/**
 * @param args
 */
public static void main(final String[] args)
{

    final TestDialog test = new TestDialog();
    test.enterEventDispatcher();

}

public TestDialog()
{

    UiApplication.getUiApplication().invokeLater(new Runnable()
    {
        public void run()
        {
            //the dialog
            final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);

            if (d.doModal() == Dialog.YES)
            {
                System.out.println("selection made yes");
                this.notify();
            }
            else
            {
                System.out.println("selection made no");
                System.exit(0);
            }

        }
    });

    synchronized (this)
    {
        try
        {
            this.wait();
        }
        catch (final Exception e)
        {
            e.printStackTrace();
        }
    }

    //finally AFTER the dialog has been closed and everything in dialogClosed() has been done, play a sound
    System.out.println("done");
}

}

最后我想利用的忙等待。仍然没有成功。对话只是不弹出。即使在主线程中while循环Thread.sleep代码（1000）UI线程似乎不起作用。这里是繁忙的等待中SSCCE：

And finally I tried making use of busy waiting. Still no success. The Dialog just doesn't pop up. Even with the Thread.sleep(1000) in the while loop in the main thread the UI thread seems not to work. Here is the SSCCE with the busy waiting:

    package TestDialog;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;

public class TestDialog extends UiApplication
{
    /**
     * @param args
     */
    public static void main(final String[] args)
    {

        final TestDialog test = new TestDialog();
        test.enterEventDispatcher();

    }

    private volatile boolean _blocked = true;

    public TestDialog()
    {

        UiApplication.getUiApplication().invokeLater(new Runnable()
        {
            public void run()
            {
                //the dialog
                final Dialog d = new Dialog(Dialog.D_YES_NO, "vibrate?", Dialog.OK, Bitmap.getPredefinedBitmap(Bitmap.QUESTION), Dialog.FIELD_TOP);

                if (d.doModal() == Dialog.YES)
                {
                    System.out.println("selection made yes");
                    _blocked = false;
                }
                else
                {
                    System.out.println("selection made no");
                    System.exit(0);
                }

            }
        });

        while (_blocked)
        {
            try
            {
                Thread.sleep(1000);
            }
            catch (final Exception e)
            {
                //safety catch
            }
        }
        finish();

    }

    private void finish()
    {
        System.out.println("done");
    }

}

感谢您的帮助。

Haferblues

Haferblues

推荐答案

HI我终于在黑莓论坛在这里的答案：<一href=\"http://supportforums.blackberry.com/t5/Java-Development/Startup-YES-NO-Dialog-should-stop-the-launchign-process-of-the/m-p/1725085\" rel=\"nofollow\">http://supportforums.blackberry.com/t5/Java-Development/Startup-YES-NO-Dialog-should-stop-the-launchign-process-of-the/m-p/1725085

HI I finally got an answer in the Blackberry forum here: http://supportforums.blackberry.com/t5/Java-Development/Startup-YES-NO-Dialog-should-stop-the-launchign-process-of-the/m-p/1725085

最终的解决方案，这对我的工作（而且看上去更漂亮，然后我在上面所做的一切）如下：

The final solution, which works for me (and looks much nicer then everything I did above) is as follows:

    package TestDialog;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.container.MainScreen;

public class TestDialog extends UiApplication implements Runnable
{
    /**
     * @param args
     */
    public static void main(final String[] args)
    {

        final TestDialog test = new TestDialog();
        test.invokeLater(test);

        test.enterEventDispatcher();

    }

    public TestDialog()
    {

    }

    public void run()
    {

        final int answer = Dialog.ask(Dialog.D_YES_NO, "continue?");
        //        pushGlobalScreen(new Dialog(Dialog.D_YES_NO, "continue?", 0, null, Dialog.GLOBAL_STATUS), 1, TestDialog.GLOBAL_QUEUE | TestDialog.GLOBAL_MODAL);

        if (answer == Dialog.YES)
        {
            System.out.println("user clicked yes");
        }
        else
        {
            System.exit(0);
        }

        pushScreen(new MyScreen("App loaded"));
    }

    class MyScreen extends MainScreen
    {

        public MyScreen(final String msg)
        {

            final LabelField title = new LabelField("First Screen", LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);
            setTitle(title);
            this.add(new RichTextField(msg));

        }

    }

}

感谢双方的大力支持。

Thanks for the great support on both sides.

这篇关于黑莓 - 显示对话框启动，等到对话框关闭的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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